Watchcase-pendant



(No Model.)

T. A. HOPKINS. WATOHGA-SE PENDANT.

No. 485 581. Patented Nomi, 1892.

UNITED STATES PATENT OFFICE.

THOMAS A. HOPKINS, or ELGIN, ASSIGNOR TO M. o. EPPENSTEIN & 00., or

CHICAGO, ILLINOIS.

WATCHCASE- PEN DANT.

SPECIFICATION forming part of Letters Patent No. 485,581, dated November1, 1892.

Application filed August 6, 1892. Serial 110.442.3530. (No model.)

To (ZZZ whom it may concern:

Be it known that I, THOMAS A. HoPKINs, residing at Elgin, Kane county,Illinois, have invented certain new and useful Improve- 5 ments inPendants for Watchcases, of which the following is a specification.

The object of my invention is to provide simple and efficient means bywhich the stemarbor of a watchcase-pendantmay be held at [O the limit ofits differentlongitudinal motionsfor the purpose of winding themainspring or setting the hands of a watch-movement without in any wayinterfering with the free rotation of the said stem-arbor; and myinvention consists in the arrangement and construction of partshereinafter described and claimed.

Referring to the drawings, Figure 1 repre sents a vertical sectionalview of my improvements, showing the stem-arbor held to its outer limitof longitudinal motion. Fig. 2 is a like View showing the stem-arborheldat its inner limit of longitudinal motion. Figs. 3, 4E, and 5 aredetails of the principal parts of my improvement, which are hereinafterdescribed.

In constructing my improved pendant for watchcases I use the ordinarywatchcase-center A, to which is attached a hollow threaded pendant B.Adjustablysecured in the pendant is a screw-threaded bushing 0, havingan axialopeningextendingthroughit. Thelower edge 0 of the opening ispreferably beveled at a suitable angle, while immediately above the sameis an internal circular stop-groove c. Fitted loosely in the bore of thebushing O is the stem-arbor D, which has the usual corrugated crown atits outer end, and its inner end is squared to fit the squared openingof the main pinion of the stem-driven train in a watch-movement. Thestem-arbor D is provided with an annular groove cl, into which is fitteda cylindrical ring E, the ends of which, not being joined together,leave an opening 6, which permits the ring to be compressed into asmaller circle when itimpinges the beveled edge 0 of the threadedbushing C, while the stem-arbor is being drawn outwardly until itpassesthrough into the circular groove 0', when it again expands and preventsany further outward motion of the stem arbor. It will be noticed by anexamination of the drawings that the inner diameter of the ring E issomewhat larger than the diameter of the groove d, so that thestem-arbor is held loosely and there is no friction to overcome inrotating the same. In pushing in the stem-arbor the ringEis againcompressed until it passes through the narrow portion of the bore, whenit again expands, thereby preventing the outward movement of thestemarbor again until more than ordinary force is used.

The stem-arbor is prevented from being pushed in too far by the face I)of the watchcrown impinging against the upper edge 0 of the threadedbushing. There is a sufficient amount of extra play left between theseparts, so that the device can be used in connection with hunting-casewatches as well as in openface watchcases.

I am aware of the fact that numerous devices have been patented foraccomplishing similar results as my invention by altogether differentmeans, and while I do not claim my invention in the broadest sense I donot in- 5 tend to limit myself to the exact form or arrangement of partsas are hereinbefore shown and described, but do depart therefrom asnocessity may demand or occasion warrant without departing from thespirit of the in- So vention.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

As an improvement in pendants for watchcases, in combination with ahollow pendant,

a bushing adjustably secured therein, provided with an internalstop-groove, a compressible ring mounted loosely on the stemarbor andadapted to spring in and out of said groove, and thelongitudinally-rotatable stem-arbor carrying the compressible ring,substantially as described.

THOMAS A. HOPKINS.

Witnesses:

Or'ro A. STARKE,

M. ABRAHAM.

